This is a pretty timely topic, I uploaded a chapter to my webtoon last night that was decidedly heavier than the past chapters (Intended, I had been easing into it and I wanted to show the readers the "reality" of the main character's job) and I got quite a few comments of people who were uncomfortable with it. Two people told me they were unsubbing because they couldn't take it, which I found surprising because I thought the situation I had introduced was decidedly mild. There was no gore, only words.
I think the fact was that the situation I had presented was too close to the misfortunes of reality for some people, and made them uncomfortable because then my comic crossed the line from "fun fictional murder romp" to "psychological study on societal pressures." However I got an overwhelmingly positive response as well, that far outweighed the bad. I think people WANT to see these kinds of stories, but a lot of authors are too scared because there are the 2% that get really uncomfortable with it.
My story is not horror, so I'm not going for shock value. I'm personally against shock for the sake of shock, I see it kind of like a jumpscare in a horror game. I want shocking things to have a purpose- In my comic a character describes how another character killed her kid, and it wasn't suppose to be "shocking"- It was meant as a rebuttal to her saying that she killed her kid out of mercy.
However if anyone wants to write like that, they're totally entitled to. Your story isn't there to make your readers comfortable, it's meant to tell a story that YOU want to tell. If that makes your readers uncomfortable, they can go elsewhere. I guess there are times when this is distasteful, if you advertise your series as rated G and then chapter 7 a character's brain explodes and their guts go everywhere that's just straight up lying to an audience haha, but if you're honest about your series then go hog-wild.